/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.db.mpp.execution.operator.schema;

import org.apache.iotdb.commons.path.PartialPath;
import org.apache.iotdb.db.mpp.execution.operator.OperatorContext;
import org.apache.iotdb.db.mpp.execution.operator.source.SourceOperator;
import org.apache.iotdb.db.mpp.plan.planner.plan.node.PlanNodeId;
import org.apache.iotdb.tsfile.read.common.block.TsBlock;

import java.util.List;
import java.util.NoSuchElementException;

import static org.apache.iotdb.tsfile.read.common.block.TsBlockBuilderStatus.DEFAULT_MAX_TSBLOCK_SIZE_IN_BYTES;

public abstract class SchemaQueryScanOperator implements SourceOperator {

    protected OperatorContext operatorContext;
    protected List<TsBlock> tsBlockList;
    protected int currentIndex = 0;

    protected int limit;
    protected int offset;
    protected PartialPath partialPath;
    protected boolean isPrefixPath;

    protected PlanNodeId sourceId;

    protected SchemaQueryScanOperator(
            PlanNodeId sourceId,
            OperatorContext operatorContext,
            int limit,
            int offset,
            PartialPath partialPath,
            boolean isPrefixPath) {
        this.operatorContext = operatorContext;
        this.limit = limit;
        this.offset = offset;
        this.partialPath = partialPath;
        this.isPrefixPath = isPrefixPath;
        this.sourceId = sourceId;
    }

    protected abstract List<TsBlock> createTsBlockList();

    public PartialPath getPartialPath() {
        return partialPath;
    }

    public int getLimit() {
        return limit;
    }

    public int getOffset() {
        return offset;
    }

    public void setLimit(int limit) {
        this.limit = limit;
    }

    public void setOffset(int offset) {
        this.offset = offset;
    }

    public boolean isPrefixPath() {
        return isPrefixPath;
    }

    @Override
    public OperatorContext getOperatorContext() {
        return operatorContext;
    }

    @Override
    public TsBlock next() {
        if (!hasNext()) {
            throw new NoSuchElementException();
        }
        currentIndex++;
        return tsBlockList.get(currentIndex - 1);
    }

    @Override
    public boolean hasNext() {
        if (tsBlockList == null) {
            tsBlockList = createTsBlockList();
        }
        return currentIndex < tsBlockList.size();
    }

    @Override
    public boolean isFinished() {
        return !hasNextWithTimer();
    }

    @Override
    public PlanNodeId getSourceId() {
        return sourceId;
    }

    @Override
    public long calculateMaxPeekMemory() {
        return DEFAULT_MAX_TSBLOCK_SIZE_IN_BYTES;
    }

    @Override
    public long calculateMaxReturnSize() {
        return DEFAULT_MAX_TSBLOCK_SIZE_IN_BYTES;
    }

    @Override
    public long calculateRetainedSizeAfterCallingNext() {
        return 0L;
    }
}
